KATYAL, V. and GANGWAR, B. (2013) “Long-term effect of integrated nutrient management on crop productivity of rice (Oryza sativa) -rice system*”, The Indian Journal of Agricultural Sciences, 70(2). Available at: https://epubs.icar.org.in/index.php/IJAgS/article/view/28049 (Accessed: 24 July 2026).